GE's T8 LED tubes replace 24-inch T81-inch diameterfluorescent bulbs using the existing fixture & electronic ballast. It's slim size fits in the same fixtures as traditional 24-inch T8 fluorescent bulbs. Why make the switch to LED? GE's LED tubes are rated to last 36,000 hours. They provide long 16-year life based on six hours use per day, so you'll replace less often. Bulb / Tube: Tube; Bulb / Tube Technology: LED; Bulb / Tube Type: T8; Brightness: 800 lm.